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Simple phenomena of magnetism

Simple phenomena of magnetism

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Question 13

An engineer is trying to demagnetise a strong steel magnet. They consider the following four procedures:

  1. Placing the magnet inside a solenoid carrying a steady direct current (DC) and slowly increasing the current.
  2. Heating the magnet well above its Curie temperature and allowing it to cool while oriented in an east-west direction.
  3. Hammering the magnet repeatedly while it is aligned in an east-west direction.
  4. Placing the magnet inside a solenoid connected to an alternating current (AC) supply and slowly withdrawing the magnet.

Which of these procedures will successfully demagnetise the steel magnet?

A

2 and 3 only

B

1, 2 and 4 only

C

2, 3 and 4 only

D

1, 2, 3 and 4

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Simple phenomena of magnetism Questions

  1. IGCSE
  2. /Physics
  3. /Simple phenomena of magnetism

169 exam-style questions on CIE IGCSE Physics Simple phenomena of magnetism, covering Simple phenomena of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.

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